VoltPlan Wiring Diagrams is answering right now. Last checked 10 min ago. 81 installs a week from npm. It exposes 9 tools. Last commit 7 Nov 2026.
Generate 12V/24V/48V wiring diagrams and size wires, fuses, batteries, solar, and inverters.
Installs per day
peak 14 · avg 6 · +4% w/w
a month agotoday
Uptime history
91 days of history · worst day 98%
91 days agonow
100.0%
Uptime 24h
91 of 91 checks
9
Tools
read from the server
152 ms
Response time
average over 24h
81
Installs / week
npm and PyPI
What changed 4
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 22 October 2026. No other catalogue keeps this.
26 Oct
a tool description was rewritten
generate_wiring_diagram
26 Oct
a tool changed the parameters it asks for
generate_wiring_diagram
26 Oct
a tool changed version
22 Oct
a tool changed version
Nothing serious here today
Today is the operative word: we check VoltPlan Wiring Diagrams every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.
run in your terminal
claude mcp add wiring-diagram-mcp --transport http https://mcp.voltplan.app/mcpSettings → Connectors → Add custom connector, then paste this address
https://mcp.voltplan.app/mcp~/.codex/config.toml
[mcp_servers.wiring-diagram-mcp]
url = "https://mcp.voltplan.app/mcp".cursor/mcp.json
{
"mcpServers": {
"wiring-diagram-mcp": {
"url": "https://mcp.voltplan.app/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"wiring-diagram-mcp": {
"type": "http",
"url": "https://mcp.voltplan.app/mcp"
}
}
}Available tools 9
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
calculate
calculate_battery_bank
Calculate the recommended battery bank size based on daily energy consumption. Accounts for days of autonomy (how many days without charging) and depth of discharge. Returns required capacity, number of batteries, and wiring configuration.
calculate_battery_config
Determine how to arrange batteries in series and/or parallel to achieve a target voltage and capacity. Returns the number of batteries needed, the wiring configuration (e.g. 2S3P), and step-by-step wiring instructions.
calculate_charging_time
Estimate how long it takes to charge a battery bank from a given state of charge to a target level. Accounts for the bulk charging phase (constant current, up to ~80% SoC) and the slower absorption phase (tapering current, 80-100% SoC). Works for any charging source: solar, shore power, alternator.
calculate_inverter_size
Calculate the recommended inverter size for running AC loads from a DC battery system. Accounts for continuous power, startup surge power (motors typically surge 2-3x), and includes a 25% headroom for the continuous rating. Returns the recommended inverter wattage and the DC current draw at system voltage.
calculate_power_budget
Calculate total daily energy consumption from a list of electrical loads. Each load specifies its power draw, how many hours per day it runs, and quantity. Returns total daily energy (Wh and Ah), peak power draw, and average power. This is typically the first step in sizing a battery bank and solar system.
calculate_solar_size
Calculate the required solar panel wattage to cover daily energy consumption. Accounts for peak sun hours at the location and system efficiency losses (MPPT conversion, wiring, temperature derating). Returns required wattage and common panel configurations.
calculate_wire_gauge
Calculate the recommended wire gauge / cable cross-section for a DC circuit. Considers both ampacity (current carrying capacity) and voltage drop to recommend the optimal cable size. Also returns total resistance, power loss, and a fuse recommendation. Supports copper conductors from 0.75 mm² (18 AWG) to 240 mm² (300 MCM).
component
list_component_types
List all available component types and example configurations for building wiring diagrams. Use this to understand what parameters are needed before calling generate_wiring_diagram.
generate
generate_wiring_diagram
Generate an electrical wiring diagram for campers, boats, or off-grid setups. Returns the schematic as an image (batteries, chargers, protection components, loads) and a link that opens it in the VoltPlan editor to refine, save and turn into a shopping list. Protection components (shunt, main switch, low-voltage cutoff) are auto-generated when both batteries and loads are provided. Show the user the editor link.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://mcp.voltplan.app/mcp | streamable-http | answering | 112 ms | 10 min ago |
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VoltPlan Wiring Diagrams — questions
Answers built from our own checks of this server.
What can VoltPlan Wiring Diagrams do?
It exposes 9 tools, read directly from the server on our last check. Among them: calculate_battery_bank, calculate_battery_config, calculate_charging_time, calculate_inverter_size, calculate_power_budget, calculate_solar_size and 3 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README.
How MCP servers expose tools in the first place →
Is VoltPlan Wiring Diagrams working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 152 ms. The bar chart above shows every period we have measured.
How do I connect VoltPlan Wiring Diagrams?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does VoltPlan Wiring Diagrams need an API key?
No. VoltPlan Wiring Diagrams completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is VoltPlan Wiring Diagrams?
It answers our handshake in 152 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use VoltPlan Wiring Diagrams?
The npm package wiring-diagram-mcp was installed 81 times in the last week. Week over week that is +4%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is VoltPlan Wiring Diagrams open source?
The code is open source: it is published under the MIT licence, written in TypeScript, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at mcp.voltplan.app, which runs on its operator's own terms.